Drug delivery system with magnetic ring and sensors arranged in a ring pattern

Abstract

A drug delivery system comprises an indicator element and a sensor system. The indicator element is arranged to rotate relative to a reference component and corresponding to a reference axis and comprises a magnetic ring. The sensor system comprises a plurality of magnetometers arranged non-rotational relative to the reference component and adapted to determine continuous magnetic field values from the plurality of dipole magnets, as well as processor means configured to determine on the basis of measured values from the plurality of magnetometers a rotational position and / or a rotational movement of the indicator element.

Description

REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application PCT / EP2018 / 083324 (published as WO 2019 / 110494), filed Dec. 3, 2018, which claimed priority of European Patent Applications 17205062.7, filed Dec. 4, 2017; and 17205063.5, filed Dec. 4, 2017; the contents of all above-named applications are incorporated herein by reference.[0002]The present invention generally relates to medical systems and devices for which the generation, collecting and storing of data are relevant. In specific embodiments the invention relates to systems and devices for capturing and organizing drug delivery dose data in a reliable and user-friendly way.BACKGROUND OF THE INVENTION[0003]In the disclosure of the present invention reference is mostly made to drug delivery devices comprising a threaded piston rod driven by a rotating drive member, such devices being used e.g. in the treatment of diabetes by delivery of insulin, however, this is only an exemplary use...

AI Technical Summary

Benefits of technology

The invention is a drug delivery system that uses magnetic field measurements to cancel out external and internal magnetic disturbances. The system includes multiple magnetometers that measure magnetic fields in the axial and tangential directions. By measuring magnetic fields in the axial direction, the system can determine the position and movement of the indicator element, which reduces energy consumption and signal processing requirements. Additionally, the system includes a shield that not only protects the sensor system from external magnetic fields but also helps absorb magnetic lines from a magnetized component. The shielding effect is achieved by making the circumscribing diameter of the magnetisable metal component larger than the circumscribing diameter of the magnetic indicator element. Overall, this system provides a cost-effective and energy-efficient way to cancel out magnetic disturbances and achieve required accuracy and redundancy for drug delivery applications.

Problems solved by technology

However, such logs are normally kept in handwritten notebooks, and the logged information may not be easily uploaded to a computer for data processing.

A missing or erroneous record in the log results in a misleading picture of the injection history and thus a misleading basis for the medical personnel's decision making with respect to future medication.

The latter devices are to be discarded after being emptied and so inexpensive that it is not cost-effective to build-in electronic data acquisition functionality in the device it-self.

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